This Cisco SFP-OC12-LR1 is a OC12 LR1 SFP 1310nm 40km transceiver module. The SFP-OC12-LR1 transceiver module provides a low cost high-performance connection. We supply the SFP-OC12-LR1 equivalent SFP transceivers and make sure it is fully compatible with your system.